Tap + button on the top bar, in "Add Book" screen, select layout type, type the title and author.
Tap settings icon on the bottom bar, and then select "cover image" to launch cover image editor. You can edit cover image in WYSIWYG interface.
In element list, tap chapter heading or info button on the top bar. In the "Edit Chapter" screen, you can edit chapter heading, alignment and font style as well.
In chapter list, tap edit button on the bottom bar to change to edit mode. Select the chapters and then tap delete button to delete the selected elements.
In element list, tap + button and then "add element" menu is popped up. Select one of commands to add elements to the chapter.
In Add Element menu, tap image. There are many options to import photos. When you tap photo library, you can browse and select multiple photos from photo library.
In Add Element menu, tap video. There are many options to import videos. When you tap YouTube video, you can search video using keywords or use video link to add YouTube video.
In Add Element menu, tap audio and then tap audio recording.
In Audio Recording screen, tap start button to start recording. At the same time, you can browse the current page's content.
In element list, tap edit button on the top bar to change to edit mode. Select elements and then tap delete button on the bottom bar to delete the selected elements.
Tap book title to launch "Edit Book Information" screen. You can change book title, author, publisher, rights, etc.
In main chapter list, tap settings button on the bottom bar and then select Book Style.
In Book Style screen, you can change font name, font size, indentation, etc. These settings are applied to the current book.
After finishing your book, tap Publish button on the bottom bar. In Publish screen, select EPUB and then tap Generate Book button to generate book at the first time. If you update content of the book, tap Re-generate Book button to regenerate book.
In Generate Book screen, you can change option if you want. Finally tap Start Processing button to start generation of book.
After generating book, back to Publish screen. Now, you can tap Open Book In button to open book in EPUB readers, tap "Upload to Google Drive" to upload file to specific folder, etc.